GENERAL MAINTENANCE AND PREVENTIVE MAINTENANCE PROCEDURES.

TB 11-5820-890-12

4-7. GENERAL MAINTENANCE AND PREVENTIVE MAINTENANCE PROCEDURES.

When the 31 U reruns the BIT and determines that the ANCD is NMC, the ANCD will be tagged with a detailed

description of the symptoms of the failure so that the COMSEC Depot and contractor maintenance personnel can

duplicate the failure mechanism. The following steps provide a structure for determining that the ANCD has indeed

failed.

STEP 1

Action should be taken to verify that the ANCD is at fault. Visually inspect the unit for obvious causes of

trouble (i.e., loose cable connection, loose CIK, broken keypad, etc.).

STEP 2

Perform a nondestructive BIT (Warm Boot) test on the ANCD. An error message returned during the test

indicates a failed unit.

STEP 3

Replace the batteries and perform another nondestructive BIT test on the ANCD. An error message returned

during this test indicates a failed unit.

STEP 4

If the ANCD tests defective, the NMC ANCD must be forwarded through the normal supply channels to the

COMSEC Depot for proper disposition at that location.

STEP 5

The losing unit will then requisition a replacement ANCD through the normal supply channels.

4-8. VISUAL INSPECTION.

Visually inspect the ANCD case for cracks, chips, or broken parts. Inspect the connectors for loose or damaged

pins. Check the mechanical operation of the keypad. Check the Liquid Crystal Display (LCD) for damage.

4-9. CLEANING.

Clean the outside of the equipment with a clean, dry cloth to remove any accumulated dirt, corrosion or mildew. The

case of the ANCD is designed to prevent dust or dirt from entering the unit; therefore, internal cleaning is not

necessary or possible.

4-10. TOOLS AND TEST EQUIPMENT.

The ANCD requires only a flat blade screwdriver or coin to open the battery compartment to replace the battery.

4-11. BATTERY REPLACEMENT.

WARNING

The lithium battery used with your manpack radio is hazardous if misused or tampered with before, during,

or after discharge. Strictly observe the following precautions to prevent injury to personnel or damage to

equipment.

DO NOT heat, short circuit, incinerate, crush, puncture, disassemble, or otherwise mutilate battery.

DO NOT recharge or test batteries for capacity.

DO NOT store battery in equipment during periods of non-use.

TURN OFF equipment immediately if you feel battery case becoming very hot, hear battery venting

(hissing or burping), or smell irritating gas (sulphur dioxide). Remove battery only after it cools to the

touch; then return it to supply for disposal.

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